Sugerencias
Quizá quiso decir:
Bulletin of the academy of pedagogic sciences of the RSFSR ; 106
Proceedings of the National Academy of Sciences of the United States of America
Annals of the New York Academy of Sciences
Proceeding of the California Academy of Sciences
StÃÄnicÃÄ, Pantelimon Institute of Mathematics of the Romanian Academy Rumania
Stanica, Pantelimon Institute of Mathematics of the Romanian Academy Rumania